linux-kernel - Re: [patch] cfq: Don't allow queue merges for queues that have no process references

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Message-ID: <4C1A6658.1070704@kernel.dk>
Date:	Thu, 17 Jun 2010 20:15:52 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	linux-kernel@...r.kernel.org, carns@....anl.gov
Subject: Re: [patch] cfq: Don't allow queue merges for queues that have no
 process references

On 2010-06-17 16:19, Jeff Moyer wrote:
> Hi,
> 
> A user reported a kernel bug when running a particular program that did
> the following
> 
> created 32 threads
> - each thread took a mutex, grabbed a global offset, added a buffer size
>   to that offset, released the lock
> - read from the given offset in the file
> - created a new thread to do the same
> - exited

[snip]

Thanks for doing the excellent writeup and nailing this bug, I'll commit
it and mark it for -stable.

-- 
Jens Axboe

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